Getting there...
Hey, it's a good start. True homage to Pico's School. Take your time on your next project, refine some elements, and you'll get yourself a smashing hit next time.
I agree with some comments about the guns, the candy, and the IR security - I admit, the IR security is a smart quirk, but casual flash viewers usually don't know about the right-click/zoom in option. Perhaps if one of your post-its has some hints about right clicking... it should help.
Giving the player more freedoms to move around helps too. I like to see places that are not part of the story- shooting things randomly is a nice touch; if the candy store is not an essential part of the story, it would have been a fun addition. Or, if you shoot out the lights in a room and later your enemy has a disadvantage because you blew out the lights earlier (or similar things), it would have been great.
My greatest gripes would have to be sound effects- a lot of essential sounds are missing from the game, it shows especially around the credits, when it's just absolute silence. Hint: download tons of game demos. Especially ones from cheap ass companies that you've never heard of.
Still, kudos, man. This game really captured the pico spirit.